Re: Parfait and UoM (java) RPM packages

Hi,

On 2016-10-19 10:44, Marko Myllynen wrote:
> On 2016-10-19 01:45, Nathan Scott wrote:
>>> Thank you.
>>
>> No problem.  Have you had a chance to try them out?
> 
> I tried them out. Here are the steps I used on a fresh F24 installation,
> perhaps these coud serve as a basis for Quick Guide Java section when
> all the pieces are in place:
> 
> 1. Install PCP, enable pmcd, make sure MMV is on, and metrics ok
> 2. Install Java if needed, check it works
> 3. Install Parfait from the Copr repo
> X. Fix parfait-agent.jar, can be skipped when the fix is in the next RPM
> build: unzip the jar, remove the top-most MANIFEST.MF, add the following
> line to META-INF/MANIFEST.MF, and re-create the jar:
> Premain-Class: io.pcp.parfait.ParfaitAgent
> 4. Start a Java application with the agent
> # java -cp .:/usr/share/java/parfait
> -javaagent:/usr/share/java/parfait/parfait-agent.jar
> 5. Check the newly appeared metrics
> # pminfo mmv
> mmv.HelloWorld.java.uptime

Hmm, when starting first instance of the might HelloWorld test case and
monitoring mmv.HelloWorld.java.uptime for a while, I see the expected
uptime:

# pminfo -f mmv.HelloWorld.java.uptime

mmv.HelloWorld.java.uptime
    value 49516

But when starting second instance, this happens:

# pminfo -f mmv.HelloWorld.java.uptime

mmv.HelloWorld.java.uptime
    value 2534

It seems that any user who is able (*) to start the same application can
"override" the metrics for everyone else.

*) Btw, what's the recommended way to enable MMV for non-root users? I did

# mkdir -p /var/lib/pcp/tmp/mmv
# chgrp testuser /var/lib/pcp/tmp/mmv
# chmod g+rwx /var/lib/pcp/tmp/mmv

but this isn't very appealing as now testuser is able to "override" an
instance being run by root:

# When HelloWorld is running under root:
-rw-r--r--. 1 root root     16K 2016-10-19 11:11 HelloWorld
# When HelloWorld is then started by testuser:
-rw-rw-r--. 1 testuser testuser 16K 2016-10-19 11:11 HelloWorld

Thanks,

-- 
Marko Myllynen

-=-=-=-=-=-=-=-=-=-=-=-
pcp mailing list
[email protected]
https://groups.io/g/pcp/messages
-=-=-
Groups.io Links:

You receive all messages sent to this group.

View/Reply Online (#14547): https://groups.io/g/pcp/message/14547
View All Messages In Topic (11): https://groups.io/g/pcp/topic/2895998
Mute This Topic: https://groups.io/mt/2895998?uid=174580
New Topic: https://groups.io/g/pcp/post

Change Your Subscription: https://groups.io/g/pcp/editsub?uid=174580

Group Home: https://groups.io/g/pcp
Contact Group Owner: [email protected]

Terms of Service: https://groups.io/static/tos

Unsubscribe: https://groups.io/g/pcp/leave/354243/563757577/xyzzy
-=-=-=-=-=-=-=-=-=-=-=-